Document Type : Research Paper


1 Department of Animal Science, Urmia University

2 Department of Animal Science, Agriculture Faculty, Urmia University


the experiment was conducted to investigate the effect of different fat sources in the starter diet on the growth and health of early weaned Ghezel lambs. Twenty female lambs after 4 weeks of breastfeeding was randomly divided into 4 groups and consumed starter diets containing 3% calcium salt of unsaturated fatty acids (flaxseed oil, soybean oil and fish oil) for 2 month after 2 weeks of adaptation. The control group were only breast fed. Dietary inclusion of protected flaxseed oil significantly increased DMI and weight gain. Dietary treatments significantly affect the biometric characteristics and the highest amount of NDF, ADF, CP and OM digestibility coefficients were observed in protected flaxseed oil fed lambs, with no effects on fatty acid digestibility. Concentration and molar ratios of VFA and ruminal pH did not affect by dietary treatments. Total blood protein levels significantly decreased in fish oil group compared to control. Cholesterol and blood glucose levels, also decreased significantly in all treatments compared to those of breast-fed lambs, but triglyceride and albumin levels did not differ significantly. In conclusion, the experimental results showed that early weaning and inclusion of flaxseed calcium salts in starter diet improves the growth performance of Ghezel lambs.